metal-organic compounds
Poly[bis[μ-1-cyclopropyl-6-fluoro-4-oxido-7-(1-piperazinyl)-1,4-dihydroquinoline-3-carboxylato]nickel(II)]
aSchool of Pharmaceutical Science, Harbin Medical University, Harbin 150086, People's Republic of China, and bDepartment of Pharmacy, Qiqihar Medical University, Qiqihar 161042, People's Republic of China
*Correspondence e-mail: liuyaqin6688@126.com
In the title compound, [Ni(C17H17FN3O3)2]n, the NiII atom exists in a distorted trans-NiN2O4 octahedral geometry defined by two monodentate N-bonded and two bidentate O,O-bonded 1-cyclopropyl-6-fluoro-4-oxido-7-(1-piperazinyl)-1,4-dihydroquinoline-3-carboxylate (ciprofloxacinium) monoanions. The extended two-dimensional structure is a square grid. The Ni atom lies on a center of inversion.
Related literature
For the manganese, zinc and copper complexes of the ciprofloxacinium (cf) anion, see: Xiao et al. (2005); An et al. (2007). For background on the medicinal uses of Hcf, see: Mizuki et al. (1996).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 1998); cell SAINT-Plus (Bruker, 1998); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1998); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536807065555/cs2060sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536807065555/cs2060Isup2.hkl
A mixture of Ni(NO3)2.6H2O (0.07 g, 0.25 mmol), ciprofloxacin hydrochloride (0.19 g, 0.5 mmol), and water (12 ml) was stirred for 30 min in air. The mixture was then transferred to a 23 ml Teflon-lined hydrothermal bomb. The bomb was kept at 433 K for 72 h under autogenous pressure. Green single crystals of the title compound suitable for X-ray analysis were obtained from the reaction mixture after cooling. Green blocks of (I) with a yield of 21%. Anal. Calc. for C34H34F2N6O6Ni: C 56.77, H 4.73, N 11.69%, O 13.36; Found: C 56.73, H 4.78, N 11.64%, O 13.40.
The carbon-bound H atoms were positioned geometrically (C—H = 0.93–0.97 Å) and refined as riding with Uiso(H) = 1.2Ueq(C). The N-bound H atom was located in a difference map and refined with a distance restraint of 0.86 (1) Å and the constraint Uiso(H) = 1.2Ueq(N).
Ciprofloxacin (1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo -7-(1-piperazinyl)-3-quinoline carboxylic acid, H-cf) is a member of a class of quinolones that is used to treat infections (Mizuki et al., 1996). Manganese(II), zinc(II) and copper(II) derivatives of H-cf have been reported (Xiao et al., 2005; An et al., 2007). The title compound nickel(II) derivative is a two-dimensional coordination polymer in which the anion acts in a bridging mode (Fig. 1).
The Ni(II) atom is coordinated by four oxygen atoms and two N atoms from four cf ligands (two monodentate-N and two O,O-bidentate) to form a square grid propagating approximately in the bc plane (Fig. 2).
For the manganese, zinc and copper complexes of the ciprofloxacinium (cf.) anion, see: Xiao et al. (2005); An et al. (2007). For background on the medicinal uses of Hcf, see: Mizuki et al. (1996).
Data collection: SMART (Bruker, 1998); cell
SMART (Bruker, 1998); data reduction: SAINT-Plus (Bruker, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1998); software used to prepare material for publication: SHELXTL (Bruker, 1998).[Ni(C17H17FN3O3)2] | F(000) = 748 |
Mr = 719.38 | Dx = 1.435 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 5.9999 (6) Å | Cell parameters from 2967 reflections |
b = 21.437 (2) Å | θ = 2.5–27.3° |
c = 13.2287 (14) Å | µ = 0.65 mm−1 |
β = 101.886 (2)° | T = 295 K |
V = 1665.0 (3) Å3 | Block, green |
Z = 2 | 0.34 × 0.26 × 0.18 mm |
Bruker SMART CCD diffractometer | 2890 independent reflections |
Radiation source: fine-focus sealed tube | 2466 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.030 |
ω scans | θmax = 25.1°, θmin = 2.5° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −6→7 |
Tmin = 0.810, Tmax = 0.892 | k = −25→21 |
8098 measured reflections | l = −15→15 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.057 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.173 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.1083P)2 + 3.3784P] where P = (Fo2 + 2Fc2)/3 |
2890 reflections | (Δ/σ)max = 0.008 |
226 parameters | Δρmax = 1.92 e Å−3 |
1 restraint | Δρmin = −0.43 e Å−3 |
[Ni(C17H17FN3O3)2] | V = 1665.0 (3) Å3 |
Mr = 719.38 | Z = 2 |
Monoclinic, P21/c | Mo Kα radiation |
a = 5.9999 (6) Å | µ = 0.65 mm−1 |
b = 21.437 (2) Å | T = 295 K |
c = 13.2287 (14) Å | 0.34 × 0.26 × 0.18 mm |
β = 101.886 (2)° |
Bruker SMART CCD diffractometer | 2890 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2466 reflections with I > 2σ(I) |
Tmin = 0.810, Tmax = 0.892 | Rint = 0.030 |
8098 measured reflections |
R[F2 > 2σ(F2)] = 0.057 | 1 restraint |
wR(F2) = 0.173 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 1.92 e Å−3 |
2890 reflections | Δρmin = −0.43 e Å−3 |
226 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Ni1 | 0.0000 | 0.5000 | 0.5000 | 0.0191 (2) | |
F1 | 0.7020 (4) | 0.74254 (11) | 0.67877 (19) | 0.0407 (6) | |
O1 | −0.2122 (4) | 0.48858 (11) | 0.6010 (2) | 0.0254 (6) | |
O2 | −0.3432 (6) | 0.49499 (14) | 0.7453 (3) | 0.0489 (9) | |
O3 | 0.1687 (4) | 0.56702 (11) | 0.59535 (18) | 0.0246 (5) | |
N1 | 0.0052 (5) | 0.65173 (14) | 0.8485 (2) | 0.0275 (7) | |
N2 | 0.5762 (5) | 0.81201 (14) | 0.8367 (2) | 0.0266 (7) | |
N3 | 0.7552 (5) | 0.93356 (13) | 0.9140 (2) | 0.0244 (6) | |
C1 | −0.2146 (6) | 0.51226 (17) | 0.6881 (3) | 0.0261 (8) | |
C2 | −0.0603 (6) | 0.56768 (15) | 0.7245 (3) | 0.0236 (7) | |
C3 | −0.1042 (6) | 0.59953 (17) | 0.8074 (3) | 0.0274 (8) | |
H3 | −0.2188 | 0.5841 | 0.8383 | 0.033* | |
C4 | 0.1761 (6) | 0.67679 (16) | 0.8044 (3) | 0.0242 (7) | |
C5 | 0.2833 (6) | 0.73317 (17) | 0.8400 (3) | 0.0264 (8) | |
H5 | 0.2370 | 0.7542 | 0.8937 | 0.032* | |
C6 | 0.4567 (6) | 0.75847 (16) | 0.7975 (3) | 0.0243 (7) | |
C7 | 0.5192 (6) | 0.72338 (17) | 0.7174 (3) | 0.0253 (8) | |
C8 | 0.4147 (6) | 0.67009 (16) | 0.6793 (3) | 0.0251 (7) | |
H8 | 0.4605 | 0.6498 | 0.6249 | 0.030* | |
C9 | 0.2363 (6) | 0.64486 (16) | 0.7215 (3) | 0.0232 (7) | |
C10 | 0.1164 (6) | 0.58960 (15) | 0.6756 (3) | 0.0216 (7) | |
C11 | −0.0674 (7) | 0.6856 (2) | 0.9317 (3) | 0.0345 (9) | |
H11 | −0.1386 | 0.7262 | 0.9124 | 0.041* | |
C12 | 0.0698 (10) | 0.6814 (3) | 1.0393 (4) | 0.0550 (13) | |
H12A | 0.0834 | 0.7187 | 1.0817 | 0.066* | |
H12B | 0.2035 | 0.6548 | 1.0512 | 0.066* | |
C13 | −0.1585 (10) | 0.6507 (3) | 1.0120 (4) | 0.0632 (16) | |
H13A | −0.1629 | 0.6055 | 1.0075 | 0.076* | |
H13B | −0.2829 | 0.6694 | 1.0379 | 0.076* | |
C14 | 0.6114 (8) | 0.86219 (18) | 0.7651 (3) | 0.0360 (9) | |
H14A | 0.4703 | 0.8850 | 0.7425 | 0.043* | |
H14B | 0.6543 | 0.8441 | 0.7047 | 0.043* | |
C15 | 0.7969 (7) | 0.90671 (18) | 0.8177 (3) | 0.0347 (9) | |
H15A | 0.9409 | 0.8846 | 0.8324 | 0.042* | |
H15B | 0.8105 | 0.9403 | 0.7703 | 0.042* | |
C16 | 0.7067 (9) | 0.8829 (2) | 0.9801 (3) | 0.0464 (12) | |
H16A | 0.6634 | 0.9008 | 1.0406 | 0.056* | |
H16B | 0.8452 | 0.8591 | 1.0035 | 0.056* | |
C17 | 0.5196 (8) | 0.8385 (2) | 0.9285 (3) | 0.0458 (12) | |
H17A | 0.5018 | 0.8054 | 0.9762 | 0.055* | |
H17B | 0.3764 | 0.8609 | 0.9104 | 0.055* | |
H3N | 0.641 (6) | 0.9588 (19) | 0.902 (4) | 0.055* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Ni1 | 0.0266 (4) | 0.0117 (4) | 0.0186 (4) | 0.0001 (2) | 0.0035 (3) | −0.0027 (2) |
F1 | 0.0451 (13) | 0.0358 (13) | 0.0491 (14) | −0.0169 (10) | 0.0284 (11) | −0.0146 (11) |
O1 | 0.0311 (13) | 0.0194 (12) | 0.0252 (13) | −0.0048 (10) | 0.0042 (10) | −0.0037 (10) |
O2 | 0.067 (2) | 0.0467 (19) | 0.0417 (18) | −0.0339 (15) | 0.0306 (17) | −0.0182 (13) |
O3 | 0.0307 (13) | 0.0206 (12) | 0.0240 (12) | −0.0021 (10) | 0.0090 (10) | −0.0075 (10) |
N1 | 0.0331 (16) | 0.0258 (16) | 0.0263 (16) | −0.0096 (12) | 0.0123 (13) | −0.0114 (12) |
N2 | 0.0389 (17) | 0.0178 (14) | 0.0245 (15) | −0.0098 (12) | 0.0101 (13) | −0.0055 (12) |
N3 | 0.0304 (16) | 0.0155 (14) | 0.0268 (15) | −0.0031 (11) | 0.0044 (12) | −0.0007 (12) |
C1 | 0.0301 (19) | 0.0209 (17) | 0.0271 (19) | −0.0049 (14) | 0.0055 (15) | −0.0005 (14) |
C2 | 0.0299 (18) | 0.0164 (17) | 0.0236 (17) | −0.0038 (13) | 0.0040 (14) | −0.0030 (13) |
C3 | 0.0317 (18) | 0.0248 (18) | 0.0267 (18) | −0.0058 (14) | 0.0081 (15) | −0.0016 (15) |
C4 | 0.0285 (18) | 0.0204 (17) | 0.0246 (18) | −0.0042 (14) | 0.0077 (14) | −0.0044 (14) |
C5 | 0.0320 (19) | 0.0224 (17) | 0.0260 (18) | −0.0060 (15) | 0.0088 (15) | −0.0087 (14) |
C6 | 0.0286 (18) | 0.0185 (17) | 0.0251 (18) | −0.0042 (14) | 0.0044 (14) | −0.0041 (14) |
C7 | 0.0291 (18) | 0.0239 (18) | 0.0253 (18) | −0.0054 (14) | 0.0108 (14) | −0.0036 (14) |
C8 | 0.0312 (18) | 0.0216 (17) | 0.0241 (17) | −0.0019 (14) | 0.0092 (14) | −0.0039 (14) |
C9 | 0.0257 (17) | 0.0217 (17) | 0.0227 (17) | −0.0029 (13) | 0.0058 (13) | −0.0039 (13) |
C10 | 0.0261 (17) | 0.0156 (16) | 0.0221 (17) | 0.0016 (13) | 0.0024 (13) | −0.0002 (13) |
C11 | 0.040 (2) | 0.033 (2) | 0.034 (2) | −0.0064 (17) | 0.0166 (17) | −0.0116 (17) |
C12 | 0.078 (3) | 0.056 (3) | 0.030 (2) | −0.009 (3) | 0.009 (2) | −0.014 (2) |
C13 | 0.094 (4) | 0.063 (3) | 0.046 (3) | −0.029 (3) | 0.045 (3) | −0.017 (2) |
C14 | 0.058 (3) | 0.0240 (19) | 0.0253 (19) | −0.0120 (17) | 0.0057 (18) | −0.0016 (15) |
C15 | 0.050 (2) | 0.029 (2) | 0.029 (2) | −0.0149 (17) | 0.0159 (17) | −0.0059 (16) |
C16 | 0.074 (3) | 0.039 (2) | 0.029 (2) | −0.035 (2) | 0.018 (2) | −0.0119 (18) |
C17 | 0.064 (3) | 0.041 (2) | 0.040 (2) | −0.032 (2) | 0.028 (2) | −0.0232 (19) |
Ni1—O3 | 2.038 (2) | C5—C6 | 1.391 (5) |
Ni1—O3i | 2.038 (2) | C5—H5 | 0.9300 |
Ni1—O1i | 2.041 (3) | C6—C7 | 1.411 (5) |
Ni1—O1 | 2.041 (3) | C7—C8 | 1.350 (5) |
Ni1—N3ii | 2.189 (3) | C8—C9 | 1.412 (5) |
Ni1—N3iii | 2.189 (3) | C8—H8 | 0.9300 |
F1—C7 | 1.365 (4) | C9—C10 | 1.453 (5) |
O1—C1 | 1.261 (5) | C11—C13 | 1.491 (6) |
O2—C1 | 1.243 (5) | C11—C12 | 1.492 (7) |
O3—C10 | 1.264 (4) | C11—H11 | 0.9800 |
N1—C3 | 1.353 (5) | C12—C13 | 1.495 (7) |
N1—C4 | 1.387 (5) | C12—H12A | 0.9700 |
N1—C11 | 1.459 (5) | C12—H12B | 0.9700 |
N2—C6 | 1.396 (4) | C13—H13A | 0.9700 |
N2—C17 | 1.443 (5) | C13—H13B | 0.9700 |
N2—C14 | 1.476 (5) | C14—C15 | 1.521 (5) |
N3—C16 | 1.461 (5) | C14—H14A | 0.9700 |
N3—C15 | 1.466 (5) | C14—H14B | 0.9700 |
N3—Ni1iv | 2.189 (3) | C15—H15A | 0.9700 |
N3—H3N | 0.861 (10) | C15—H15B | 0.9700 |
C1—C2 | 1.522 (5) | C16—C17 | 1.521 (6) |
C2—C3 | 1.363 (5) | C16—H16A | 0.9700 |
C2—C10 | 1.430 (5) | C16—H16B | 0.9700 |
C3—H3 | 0.9300 | C17—H17A | 0.9700 |
C4—C5 | 1.404 (5) | C17—H17B | 0.9700 |
C4—C9 | 1.402 (5) | ||
O3—Ni1—O3i | 180.00 (9) | C7—C8—H8 | 119.7 |
O3—Ni1—O1i | 91.34 (10) | C9—C8—H8 | 119.7 |
O3i—Ni1—O1i | 88.66 (10) | C4—C9—C8 | 117.4 (3) |
O3—Ni1—O1 | 88.66 (10) | C4—C9—C10 | 122.7 (3) |
O3i—Ni1—O1 | 91.34 (10) | C8—C9—C10 | 119.8 (3) |
O1i—Ni1—O1 | 180.000 (1) | O3—C10—C2 | 126.1 (3) |
O3—Ni1—N3ii | 93.30 (11) | O3—C10—C9 | 118.4 (3) |
O3i—Ni1—N3ii | 86.70 (11) | C2—C10—C9 | 115.4 (3) |
O1i—Ni1—N3ii | 91.38 (11) | N1—C11—C13 | 119.9 (4) |
O1—Ni1—N3ii | 88.62 (11) | N1—C11—C12 | 119.9 (4) |
O3—Ni1—N3iii | 86.70 (11) | C13—C11—C12 | 60.2 (3) |
O3i—Ni1—N3iii | 93.30 (11) | N1—C11—H11 | 115.3 |
O1i—Ni1—N3iii | 88.62 (11) | C13—C11—H11 | 115.3 |
O1—Ni1—N3iii | 91.38 (11) | C12—C11—H11 | 115.3 |
N3ii—Ni1—N3iii | 180.000 (1) | C11—C12—C13 | 59.9 (3) |
C1—O1—Ni1 | 132.5 (2) | C11—C12—H12A | 117.8 |
C10—O3—Ni1 | 127.7 (2) | C13—C12—H12A | 117.8 |
C3—N1—C4 | 119.4 (3) | C11—C12—H12B | 117.8 |
C3—N1—C11 | 121.3 (3) | C13—C12—H12B | 117.8 |
C4—N1—C11 | 119.1 (3) | H12A—C12—H12B | 114.9 |
C6—N2—C17 | 116.4 (3) | C11—C13—C12 | 60.0 (3) |
C6—N2—C14 | 119.4 (3) | C11—C13—H13A | 117.8 |
C17—N2—C14 | 110.0 (3) | C12—C13—H13A | 117.8 |
C16—N3—C15 | 108.6 (3) | C11—C13—H13B | 117.8 |
C16—N3—Ni1iv | 111.6 (2) | C12—C13—H13B | 117.8 |
C15—N3—Ni1iv | 119.4 (2) | H13A—C13—H13B | 114.9 |
C16—N3—H3N | 109 (4) | N2—C14—C15 | 110.6 (3) |
C15—N3—H3N | 111 (4) | N2—C14—H14A | 109.5 |
Ni1iv—N3—H3N | 96 (4) | C15—C14—H14A | 109.5 |
O2—C1—O1 | 124.1 (3) | N2—C14—H14B | 109.5 |
O2—C1—C2 | 116.9 (3) | C15—C14—H14B | 109.5 |
O1—C1—C2 | 118.9 (3) | H14A—C14—H14B | 108.1 |
C3—C2—C10 | 118.9 (3) | N3—C15—C14 | 113.8 (3) |
C3—C2—C1 | 116.1 (3) | N3—C15—H15A | 108.8 |
C10—C2—C1 | 124.9 (3) | C14—C15—H15A | 108.8 |
N1—C3—C2 | 125.4 (3) | N3—C15—H15B | 108.8 |
N1—C3—H3 | 117.3 | C14—C15—H15B | 108.8 |
C2—C3—H3 | 117.3 | H15A—C15—H15B | 107.7 |
N1—C4—C5 | 121.3 (3) | N3—C16—C17 | 114.6 (4) |
N1—C4—C9 | 118.1 (3) | N3—C16—H16A | 108.6 |
C5—C4—C9 | 120.6 (3) | C17—C16—H16A | 108.6 |
C6—C5—C4 | 121.9 (3) | N3—C16—H16B | 108.6 |
C6—C5—H5 | 119.0 | C17—C16—H16B | 108.6 |
C4—C5—H5 | 119.0 | H16A—C16—H16B | 107.6 |
C5—C6—N2 | 122.7 (3) | N2—C17—C16 | 110.1 (3) |
C5—C6—C7 | 115.6 (3) | N2—C17—H17A | 109.6 |
N2—C6—C7 | 121.4 (3) | C16—C17—H17A | 109.6 |
C8—C7—F1 | 117.5 (3) | N2—C17—H17B | 109.6 |
C8—C7—C6 | 123.8 (3) | C16—C17—H17B | 109.6 |
F1—C7—C6 | 118.6 (3) | H17A—C17—H17B | 108.2 |
C7—C8—C9 | 120.5 (3) |
Symmetry codes: (i) −x, −y+1, −z+1; (ii) x−1, −y+3/2, z−1/2; (iii) −x+1, y−1/2, −z+3/2; (iv) −x+1, y+1/2, −z+3/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3N···O2v | 0.86 (1) | 2.48 (4) | 3.184 (4) | 139 (5) |
Symmetry code: (v) −x, y+1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | [Ni(C17H17FN3O3)2] |
Mr | 719.38 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 295 |
a, b, c (Å) | 5.9999 (6), 21.437 (2), 13.2287 (14) |
β (°) | 101.886 (2) |
V (Å3) | 1665.0 (3) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.65 |
Crystal size (mm) | 0.34 × 0.26 × 0.18 |
Data collection | |
Diffractometer | Bruker SMART CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.810, 0.892 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8098, 2890, 2466 |
Rint | 0.030 |
(sin θ/λ)max (Å−1) | 0.597 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.057, 0.173, 1.00 |
No. of reflections | 2890 |
No. of parameters | 226 |
No. of restraints | 1 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 1.92, −0.43 |
Computer programs: SMART (Bruker, 1998), SAINT-Plus (Bruker, 1998), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL (Bruker, 1998).
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3N···O2i | 0.861 (10) | 2.48 (4) | 3.184 (4) | 139 (5) |
Symmetry code: (i) −x, y+1/2, −z+3/2. |
Acknowledgements
The authors acknowledge financial support by the Science Foundation of Qiqihar Medical University (grant No. 20044405).
References
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Ciprofloxacin (1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo -7-(1-piperazinyl)-3-quinoline carboxylic acid, H-cf) is a member of a class of quinolones that is used to treat infections (Mizuki et al., 1996). Manganese(II), zinc(II) and copper(II) derivatives of H-cf have been reported (Xiao et al., 2005; An et al., 2007). The title compound nickel(II) derivative is a two-dimensional coordination polymer in which the anion acts in a bridging mode (Fig. 1).
The Ni(II) atom is coordinated by four oxygen atoms and two N atoms from four cf ligands (two monodentate-N and two O,O-bidentate) to form a square grid propagating approximately in the bc plane (Fig. 2).